GOODWILL AND OTHER INTANGIBLE ASSETS, Goodwill (Details) $ in Thousands	9 Months Ended
	Dec. 31, 2018 USD ($) Unit	Dec. 31, 2017 USD ($)
GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]
Number of reporting units | Unit	1
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 85,297	$ 57,070
Goodwill, Accumulated Amortization / Impairment Loss, Beginning Balance	(8,673)	(8,673)
Goodwill, Net Carrying Amount, Beginning Balance	76,624	48,397
Acquisitions	0	27,996
Foreign currency translations	(223)	153
Goodwill, Ending Balance	85,074	85,219
Goodwill, Accumulated Amortization / Impairment Loss, Ending Balance	(8,673)	(8,673)
Goodwill, Net Carrying Amount, Ending Balance	$ 76,401	$ 76,546